Chlorine-36 (C1-36) - doe-hdbk-1106-97

DOE-HDBK-1106-97

CHLORINE-36 (Cl-36)

Chlorine-36 is a medium-energy beta emitter. Use a thin-end window G-M detector or liquid

scintillation counter for detection.

1. Maximum energy: 0.710 MeV (the average energy is 0.233 MeV).

2. Maximum range in air: 7 feet (2 m).

3. Maximum range in tissue: 0.1 inch (2.6 mm).

4. IAEA toxicity classification: High-medium.

5. Physical half-life: 3 x 105 years.

6. Effective half-life (Teff): 10-29 days.

7. Critical organ:

Whole body for transportable compounds.

Lung for inhalation.

Lower large intestine for ingestion.

8. Personnel monitoring: Urinanalysis, finger rings.

9. ALI:

0.2 mCi (7 x 106 Bq) by inhalation.

2 mCi (7 x 107 Bq) by ingestion.

10. Shielding: 0.25 inches (6mm) of plexiglass.

11. Special Considerations:

Cl-36 beta particles have sufficient energy to penetrate gloves and skin.

When handling millicurie quantities, do not work over an open container.

Avoid glove and skin contamination or ensure that it is promptly detected and

removed.